北京金地中心不规则框架模型抗震性能试验研究

为给北京金地中心工程不规则钢筋混凝土框架提供抗震设计依据,进行了该框架模型的试验研究和弹性计算。试验揭示了未采取后浇技术措施(用以减小重力荷载在主梁上产生的弯矩)的模型结构的破坏形态。试验结果表明,模型结构的层受剪承载能力达到8度中震弹性地震层剪力的3.6倍,最大层间位移角超过1/50,水平力-位移关系滞回曲线稳定、无明显捏拢。根据试验研究和弹性计算结果,提出了该不规则框架“强主柱弱主(次)梁、强次柱弱次梁、强主梁弱次柱”的抗震设计理念、进行弹塑性分析、适当提高主框架柱的正截面承载力等抗震设计建议。

Experimental study on seismic behavior of Beijing Goldfield Center irregular RC frame models

In order to provide seismic resistant design basis for the irregular reinforced concrete frame of the Beijing Goldfield Center, experimental study and elastic calculation of the frame model were performed. The test revealed the failure mode of the frame model without taking the post pouring concrete measures which is used for decreasing the moments in the main beam caused by gravity loads. The test results showed that the maximum story shear carried by the model is more than 3.6 times the elastic story shear corresponding to the moderate earthquake of 8 degree of seismic fortification intensity. The maximum story drift ratio is larger than 1/50. The lateral force-displacement hysteresis loops are stable and do not have any obvious pinch phenomenon. Based on the test and calculation results, the recommendations for seismic resistant design philosophy, i.e. strong main column-weak main/secondary beam, strong secondary column-weak secondary beam, strong main beam-weak secondary column, performing elastoplastic analysis and increasing the load-carrying capacity of the main frame columns are proposed for the seismic resistant design of the irregular frame.